Measurement of Mode Interaction Due to Waveguide Surface Roughness.
Abstract
A laboratory experiment was conducted examining the effects of large slope surface roughness on mode propagation in a rigid walled waveguide. A waveguide hundreds of depths in length was developed, as well as a mode transduction system comprised of electret type mode transducers, and an amplitude and phase selectable amplifier. A device for automatically measuring surface roughness was also built. The interaction of modes with two types of surface roughness, deterministic and random, is compared to propagation in the smooth waveguide. The results demonstrate coupling between modes and difference of this coupling in the presence of either a determinisitically rough surface or a randomly rough surface. A significant change in modal phase speed due to roughness is demonstrated at selected frequencies. Keywords include: Waveguide, Mode coupling, Scattering, and Dispersion.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1984
- Accession Number
- ADA154039
Entities
People
- P. D. Hill
- S. R. Kasputis
Organizations
- Naval Postgraduate School